DE1522991A1 - Record players and similar sound reproducing devices - Google Patents

Description

DR. W. SCHALK DIPL.-I NG. PETER WlRTH »v«, «, vvi DIPL.-ING.G. E.M.DANNENBERG «DR.V. SCHMIED-KOWARZIK

6 FRANKFURT AM MAIN

OK. ItCHINHIlMER tTR. 39

5 »December 1966 PW / Hd

Phillip Bruce Kahlen
2019, East First Street, DuIuth, State of Minnesota, USA

Record players and similar sound reproducing devices

The invention relates to record players, in particular to an optical and electrical device for sound reproduction, starting from one provided with a sound groove or grooves lOirl-riger, preferably a record.

• Most prior art turntables work with a mechanical device, e.g. B. a needle that engages in the grooves of a record and thereby a mechanical vibration is generated, which is converted into an electrical signal for sound reproduction. This type of turntable has obviously certain disadvantages, e.g. B. that the groove is worn when the disk is played frequently by the calf acting on it We u. With some turntables this should be the case

overcome 8AD ORIGINAL

909844/0893

v / ground that an optical device for picking up the sound recordings from the grooved. Record was used. Many of these systems still have one on the plate attacking JT clock pin needed, while others, that no longer have mechanical contact with the record, either only monaural or only stereophonic recordings can be played or an undesired setting of the system is required.

The device according to the invention overcomes the above problems and creates an optical system for "playback" or reproducing the sound from a grooved record that has no mechanical contact with the grooves the record requires both monaural and stereophonic recordings at different speeds allowed to play.

The device according to the invention contains a first optical System that delivers light to an objective lens that passes through the Lens penetrates and hits a record groove. The light reflected from the record goes then back through the objective lens to a second optical system which takes an image on a diaphragm designs. An opening located in this diaphragm is atxlx (in the middle) divided, and the varying incidence of the on one side or the other of the division of the Aperture of differently striking light is converted or transmitted into an electrical signal, which then is implemented in conventional sound reproduction devices such as preamplifiers, amplifiers and loudspeakers.

909844/0893

The second provided in the device according to the invention optical system contains an optical member which is arranged between the first optical system and the objective in such a way that that it shields a predetermined part of the objective against incidence of light supplied by the first optical system. The light reflected from the record, which is shaded by the part of the which is shielded from incident light Lens is filtered within the second optical system to filter out polarized, reflected light, before the image is focused on the aperture.

In addition to generating a signal for sound reproduction » the electrical signal coming from the aperture used to generate a control signal for the position in a »control system that is used to move the tonearm. This The system basically consists of a control system with a damped closed servo loops, dac the tonearm tries to hold in a position in which the light hitting the record hits the record groove meets. In addition, a device is provided through which the Grooved bchall: .lctte with the correct or desired speed is teased in rotation.

BATH 909844/0893

-A-

In another embodiment, Bform is that mentioned above The aperture is provided with an opening that is divided into three parts. Two "of these * parts have an effect in the the way described above, the generation of a control signal for the correct setting of the position of the tonearm, and the third part is used in conjunction with a light filter with graded light density or graded light transmission Liquidity to generate an electrical signal for the sound again ^ sbe. This signal changes into Depending on the point of the graduated light filter, ? - f the reflected light hits.

i.fcliste / .fcina 'viru an execution ^ .ngsi'orm of the invention, both :? pielEV / c-2 .: e anhar.a der ^^ icnrungen ce. honest just, namely shows:

tig. 1 e ^ rR · cnau-pictorial view of a lattice-Si-elers, which the execution: -beis.: Iel der crij.ndungf.gemf.:. en facility represents;

_6A D 9098U / 0893

FIG. 2 is a schematic view showing the path of the beams passing through the optical Systems through to the record to be played are away from it walk;

! 'ig. 3 is a schematic view showing part of the optical system of the invention Establishment and the path of light through the optical system of a particular embodiment of the invention;

Pigο 4 in a larger kaüstab as a side view Section through a groove in the record showing the course of the striking and the represents reflected light;

l ^p ig. 5 shows a schematic representation of the manner in which the execution device according to the invention is used for generating a signal, starting from a monaural record groove;

BATH

909844/0893

Fig. 6 is a schematic representation of the type and Method of using the device according to the invention for producing a Si-jual, starting out from a stereophonic. Record groove;

Pig. 7 shows a schematic representation of the manner in which the components according to the invention are used Device for generating a signal based on a monaural groove on a record older design or a record with a wide picture; and

Fig. 8 is a schematic representation of the device, the

zu] u converting the optical signal into an electrical one Signal for sound reproduction and for controlling the position of the tonearm.

1 shows a record player with a support housing 8 on which a rotatable turntable 10 is mounted, which carries a grooved record 11. A device (not shown) for controlling the rotary movement of the turntable 10 can be fitted within the support housing. On the support housing 8, a frame 9 is also mounted, to which a tonearm 18 carrying an objective lens 17 is connected solder. The frame 9 is bev. e _i3 ; ra \ au: aen. Support housing L stored, and within the trap '' ^ hiluaej L ... λ of the frame 9 a device for controlling uer Btol. " ¹ Ii; the tonearm IG and thus the lens 17 attached .. '. Icd .-. R ..

909844/0893

In Fig. 2 and '5 the optical system is shown which can be mounted in the frame 9 and on the tonearm 18 so that. it creates an optical image of the groove on the record that is converted or transmitted into an electrical signal for sound reproduction. The optical system comprises an incandescent lamp 13 which is coated with a reflective material over its entire surface except for a small part through which the light is to emerge. A bundle of rays emerging from the incandescent lamp 13 first enters the rear end of a telescope H and then passes through a prism 15. In this schematic view, all prisms are shown as straight reflecting surfaces.After leaving the prism 15, the bundle of rays 20 passes through a prism 16, in which it is deflected downwards so that it passes through an objective 17. The bundle of rays then strikes the record 11 mounted on the turntable 10 essentially or precisely at an angle of 90 °. Between the learning prism 16 and the objective 17 is a prism

arranged to prevent the light of the Bundle of rays .; 20 more than a given part of the Lens, 17 illuminated.

A beam JJO is then reflected by the record 11, from passing through the shielded portion of the lens 17 then through dae prism 21 and further through a prism 22 and a polarizing filter on auftril'ft (eg a Bernotar) 23rd The part of the beam 30 which has been polarized as a result of multiple reflections from the record 11 does not pass through the filter 23.

90 98U / 0893 ₆ also original

The light of a bundle of rays 31 passing through the filter 23 passes through, then falls through a number of prisms 24, 25, 26 and through a microscope 27, further through Prism 28 and an eyepiece 29 in which the image of the light reflected from the record is focused, after which it goes through a prism 32 to a diaphragm 35.

t.
Two optical fiber strands 37 and 38 are connected to one another at their one end, which adjoins an opening provided in the diaphragm 35. The other end of the string 37 is connected to a light responsive device 41 and the other end of the string 38 is connected to a light responsive device 42. From the _v exploded part view of the aperture 35 (Fig. 5 to 7) show that the aperture 37 and 38, the reflected image of the disc exposes the ends of the optical fiber strands 11, which are opposed to said ends of said opening. A junction 36 formed by the connection of the strands 37 and 36 is actually only microscopic in thickness, but is shown here larger for the sake of clarity.

3 is a schematic view of some of the prisms and lenses shown in FIG. 2 to illustrate the path of the beams 20, 50 and 31 through the optical systems in one embodiment of the invention. From Pi ₁ C. iat it can be seen that dai; the incandescent lamp 1; Light in the above, /.internal Enae of the telescope 14, from which aas beam ent.; I.el 20 reaches the prism 15, da.jd ^; .s bundle of rays 20 um

9098U / 0-8 93 6AD OBiGlNAL

deflects about 90 °, which then strikes the prism 16. The beam 20 is again deflected by about 90 ° by the prism 16 and by the unshielded bearing of the lens 17 directed through it down to the record.

■ In addition, Pig. 2 and 3, like the one from the record 11 reflected bundle of rays 30 thrown back through the shielded part of the objective 17 will. In Fi ^. 3 shows how the Prisms 21 and 22 of the Pig. 2 can be replaced by a diamond-shaped prism 19. This prism causes dais the bundle 30 passes through the filter 23 in which the part of the beam 30 polarized by multiple reflections on the record 11 is filtered off. The bundle of rays 31 emerges from the filter 23 and passes through the prisms 24, 25 and 26, all of which are arranged in this way can be that the direction of the beam 31 is changed appropriately so that the optical Image is forwarded within an enclosure of any shape.

Fig. 4 shows a larger May3stab as a side view Section through a Hille 12 in the record 11 in this one In the drawing, the thick, continuous lines represent the light incident on the record 11 and the groove 12, which comes from the unshielded part of the lens 17. That shown with dashed and thin, continuous lines

BATH ORIGINAL

909844/0893

Asked light is that of the record 11 and the groove 12 reflected light through the in the shadow of the Light source lying part of the lens 17 back and continues through the optical system. Among the latter Lines, the thin, continuous lines represent those rays that experience a number of reflections in the groove 12 and have been polarized as a result. The dash-dotted lines of the pig. 4 represent the part of the reflected beam 20, which does not pass through the part of the lens 17 lying in the shadow.

Fig. 5 shows a number of images of the wavy course of a Number of grooves 12 in the case of monophonic or monaural recording. In the case of monophonic recording, the course is the corrugations of the grooves are the same on both sides. On one of the illustrated grooves 12 of FIG. 5 is in part symbolically reproduced a number of positions of the diaphragm visible, the that received at the diaphragm emanating from the groove Show picture in three time segments. In group I in Fig. 5 represent the circular sections from the Grooves 12 and the diaphragm 35 an enlargement each of a corresponding view of the left figure at the three points in time in which the picture is shown. In group II of FIG. 5, rows A, B and G each have two rectangles shown, each of the left and the right part of the opening of the aperture 35 and thus the optical Fiber strands 37 and 38 represent the amount of incident light. ü) in Arrow surrounded by a circle indicates for each of the pairs of rectangles. which side the larger part / of the image of the

80984470893 _QirlNAL

£ AD ORIGIN * ¹ -

Bille 12 receives. That through strands 37 and 38 to the directed to light-responsive device © · »41 or 42 Lioht is used to generate an electrical signal both for controlling the position of the tonearm and for sound reproduction to create.

Fig. 6 shows the same drawing as pig. 5, with the exception that the billets 12 in this case represent grooves in the case of stereophonic recording. In the case of stereophonic recording, the course of the corrugations on one side of a frame 12 is independent of the course on the other side. Here, too, three positions of the diaphragm 35 are shown on a groove 12 in three time segments. In group III, rows D, S and F; each show three enlargements of the image of the bill * 12 on the diaphragm 35 at three different times, while in group IV the three corresponding rows of pairs of rectangles are shown.

The left-hand corner of group IV in Mg. 6 represent the image present for generating the tens for one stereo channel, while the right-hand rectangles represent sound images for generating a signal Jur for the other stereo channel. The one of one; Arrows surrounded by circles show the amount of light received by the corresponding optical fiber strand 37 or 38 for each of the rectangles of the groups. An arrow pointing right indicates zeijt to a reduction aer light intensity, a left pointing arrow ζ an increase in Lichtintensiti and an upward arrow a noriuile light intensity. In Pig. 7 are further views of a groove 12, uni r./ur here with a recording with 7 turns

909844/0893

BATH ORIGINAL

per minute. At this recording speed, the Eille 12 is often much wider than when recording should be played at low speed. The image reflected by such owls is therefore not entirely achv / arz like that in Pig. 5 and 6, but has a reflected white center line 12a. · In.Fig. 7 a screen 47 is shown, which is a modification of the aperture 35. The aperture 47 serves to read the image of grooves 12, each of which has a white center line 12 a. The lower part of the opening the diaphragm 47 is connected to the optical fiber strands 37 and 36 as in the device described above. In the present case, the signal coming from the paser strands 37 and 38 is only used to control the Position of the tonearm. Then on the upper part of the opening the Blenue 47 iot another optical fiber strand 39 arranged, and d;.:. 3 absorbed or generated by this strand Signal is used to reproduce sound.

In group V the rows X, Y and Z represent the position of the center line 12a in the upper part of the opening of the diaphragm 47 in the three different times. In outer schematic 7 shows a filter 44 between the other end of the strand 39 and a light responsive device 4i -, u, eoraiiet. As in the otujeinand educated representation j, e? .9igt, the filter 44 has a different graded optical or light-permeable density, and the left part of the filter 44 is a coarser one optical density on than the right part. That of the middle

9098U / 08-9

Light coming in line 12a and incident on light-responsive device 45 thus changes, namely depending on the position in which the image of the center line 12a hits the filter '44. This process is in Group VI 7 explains where the intensity of the image of the center line 12a changes as it changes in the Hechteck moved from right to left. The arrows of the rows X, which belong to the rectangles and are surrounded by circles, Y and Z indicate the respective position of the center line 12a in the rectangle, i.e. within the upper part of the opening of the Aperture 47.

In Fig. 8 there are shown schematic circuit diagrams of the electronic device used together with that described above Device for reproducing sound on the basis of the optical image generated in the manner described above serves. Two light responsive devices are shown here as phototransistors 51 and 52. These are then arranged at one end of each of the optical fiber strands 37 and 38 and are each located in one electrical circuit. The transistor 51 has a grounded, and one through a resistor 53 with a connection terminal 55 connected electrode, while the transistor has one grounded and one through a resistor 54 with a Terminal 56 has connected electrode. The terminals 55 and 56 are connected to a voltage source. The outputs of the phototransistors 51 and ' 52 are each connected to an amplifier 57 and 58, respectively. These amplifiers

909844/0893

-H-

57 and 58 are connected to conventional sound reproduction devices such as ■ Amplifier and loudspeaker, connected. The outputs of the Amplifiers 57 and 58 are each connected to a capacitor 58 and 60 in the drawing. These capacitors are used in turn for connection to the usual sound reproduction devices and to supply the AC parts of the outputs of the amplifiers 57 and 58, respectively, to these devices.

The output of the amplifier 57 and 58 is also in each an electric circuit, each one of two lightbulbs 61 and 62 respectively. The light intensity of the light bulbs 61 ″ or 62 changes proportionally to the signal that from the phototransistor 51 and / or. 52 is delivered.

909844/0893

Adjacent to the light bulbs 61 and 62, respectively, is one of two light responsive devices 63 and 64, e.g. Photocells arranged. These photocells are each mounted on one leg of a Wheatstone bridge. the other legs, the Wheat3tonesohen bridge contain the Resist 65 and 66. Two entrance columns 71 and 72 of the Bridge are used to connect to a power source, while two output terminals in the example shown with one Tonearm controller 75 are shown connected. This device 75 receives a signal from the Wheatstone bridge that changes the position of the tonearm, as will be described in more detail below.

The operation of the device according to the invention is first best understood from FIG. In Fig. 2, the incandescent lamp 13 is coated with a reflective material shown. This coating covers all sides of the incandescent lamp 13 bia on the side through which the light is to fall. The light then falls through the rear end of the double lens telescope 14 '' '. From it to a sciunalen ribbon 20 from the essential parallel rays of light is bundled. That The beam 20 is then produced by the two prisms 15 and 16 so that it passes through the objective 17, which may be a part of a microscope, and falls as a small circle of light focused on the grooved surface of the disc 11. The prism 21 serves as a shield, which has the effect that the beam 20 passes only through a predetermined part of the objective 17 while the other half of the lens 17 in the shadow of the prism

^{21 reads} 909844/0893 BAD oH «N«.

The light reflected from the surface of the record 11 passes through both halves of the lens 17. In the part of the lens exposed to the beam 20, internal reflections take place which cancel out the image of the light reflected from the surface of the record 11 in the shadow of the prism 21 part of the lens 17 located allows the light reflected from the surface of the "record 11 light to pass through, without causing scattering light-generating light sources effectively v / ground. the falling through the shadowed part of the lens 17 light referred to herein as beam 30 i .jt, is then given by - ^ - Uig by a number of prisms 21, 22, 24, ^ 5 and '

26 reflected. These prisms are only used to guide the beam narrowly. ,. length of the reflected light beam, dai.> the size of aes optisciaen system decreased './ird. The type and location is determined, for example, by size and Fora of the tonearm 18 and the frame 9 starirnt.

Sin part aes Str.ihlenb..inelcä yO i; jt ^f iu.ü result of multiple reflections within ier groove 1 <: outer sound; .latte 11 (see Fi ₅ ,. 4) 2a h ^ iaeit a.uu- ji about scattered light, dcxs infoü; e ier multiple reflection j.oly.risiert wurue. Diasea _t oluriüi erte scattered light by means.5 of a between the Prijmeü 22 uua ..- + delegated i-Ol-irijatiorufilters, eg Bernotar.3 Ij removed. D- ^ o behind del *. Filter dj .urea uj, a optical S / £ ite; .. v. pus-filled “Jarte Strahlb .rvi el ^ 1 ο ^ ΐ-iht iil v.eoeixt - ,. i-ih ^; .: ii uuü learn light, äixs from ier surface; ° r Scha 1-i latte 11 xiii .Ye.-je-itliche.il vertiical was reflected.

9 0 98 U / 0-8 9 3

. - 17 -

The bundle of rays 31 f -Hj.lt then through a double lens system 27, which resembles that of a microscope. This brings about a further enlargement. After reflection through aas prism 28 fills the beam 31 through the Eyepiece 29 which focuses the image similarly to when viewed through an eye looking into a microscope. the Lens 29 is therefore used to focus the beam and ice on the diaphragm 35, which the beam 31 reaches after renewed reflection by a prism 32. The opening of the Aperture 35 is preferably oriented so that it is perpendicular to the longitudinal direction of the image in its longitudinal direction Express 12 runs. The length of the opening of the diaphragm 35 corresponds to the greatest deviation of the groove 12 from its normal position, from which the speed deviates alternately in its course representing the wave pattern of the recorded sound. The width of the opening of the aperture 35 represents the maximum recorded distance in the longitudinal direction of the frame 12 or the represents the maximum time interval recorded during a recording at a point in time.

The optical fiber strands 37 and 38 are attached with their one end to the opening of the diaphragm 35 adjoining and are connected to one another at this end in such a way that a microfine connection point 36 is formed. Therefore, each of the optical fiber strands 37 and 38 leads one sharply imaged part of the image generated on the diaphragm, which is reflected by the from the surface of the record 11 Light has been formed to one or the other of the light responsive devices 41 and 42.

909844/0893

FIG. 3 shows an arrangement of the various parts shown in FIG the device according to the invention can be used. In Fig. 3 is the course of the light from the incandescent lamp 13 through the 'telescope 14 and further through the prism 15, in which it is reflected at right angles, as well represented by the prism 16, in which it is reflected downwards at right angles; from here it meets in im v / it ent borrowed the vertical direction through the lens 17 on the record 11 on. The bundle of rays 30 emanating from the light reflected from the surface of the record 11 which falls through the part of the lens 17 lying in the shadow is reflected five times by prisms according to FIG. 3 and undergoes polarization filtration. In FIG. 3, these are prism 21 casting a shadow or shielding and the next reflective prism 22 of FIG. 2 combined in a single rhombic prism 19. Thus becomes the beam 30 is reflected twice within the prism 19, filtered through the filter 23 and then as desired reflected by the prisms 24, 25 and 26, from where it reaches the microscope 27 and the eyepiece 29, on which it 3 is focused sharply on the aperture 35.

The thick drawn lines in Fig. 4 represent the beam 20, which strikes the record 11 with the groove 12 in a substantially vertical direction. The dashed and the thin solid lines represent read light reflected from the record 11 and the groove 12 represents that as a bundle of rays 30 through the in the shadow of the

9098U / 0893

Illuminating light lying part of the lens 17 thrown back will. The dash-dotted lines represent the reflected light that is the part in the shadow of the lens 17 is not reached. The thin, continuous lines represent those rays that are reflected multiple times before they are reflected back through the lens 17 as part of the bundle 30. this part of the beam 30 is polarized due to the multiple reflection and does not pass through the polarizing filter 23. Hence, only the dashed lines represent that reflected light from which the bundle of light rays 31 is formed, the ultimately dae image of the groove 12 and the. Record 11 feeds the last conversion device.

It's from Pig. 4 it can be seen that only the substantially flat surface of the record 11 on both sides of the groove 12 and the very central part of the groove reflect light which passes through the entire optical system. Iu. The case of micro-grooves, v / IE with records 45, 33 1/3 and 16 revolutions _x .ro minute verv / enuet v / ground is

here the middle of the right is so small and / her angle for a

of the kitte tical reflection so critical that; read it / reflected light is essentially imperceptible and can be disregarded, but if there are significant grooves on a record at 7½ revolutions per minute, the middle area is quite visible. As will be described nilher, FIGS. 5 and 6, a vie exportation unjsi _"u orr the erfinaangsgemüßen device in records with microgrooves operates vährend in Fig. 7 is shown as a

909844/0893 ^6AD

another embodiment of the device according to the invention works at the groove or the grooves of a record for 78 revolutions per minute.

In Fig. 5, the undulations provide the groove or grooves 12 shorter wavelengths ils recorded else at records represent. Dienes :: {<rzeven wavelengths or these high frequencies are illustrated in the foregoing manner to the way in which the recording of the scanned image on the diaphragm 35 ge mil L; of the invention is used to illustrate ivlarer ^ u.

A number of divided rectangles are shown transversely of the groove or grooves 12, which represent the diaphragm "'/ 6. These rectangles represent the respective position of the opening of the diaphragm relative to the groove 12 in different time segments. It is important to note that the actual subdivision 30 (Fig. 2) within the aperture of the diaphragm is microfine and not wide i -; t as shown in Fig. 5, 6 and 7 is drawn. - The pictures four groove 1 ^, which are in the circles of the Ji ¹ Uj _- -Pe I (Fig. ~ -J>) je :: oijt, steep enlargements of the un-Ui ^- ttelbur ii / .j ·: jlj.vlii , inclined apertures and grooves in the glaich-Jü Bel-szlila; <i aar. iäe rectangles of GrU ₁ ^ e II show J: iü picture uer tiilliu 1: -. in ieii two part-ji. xzv BlgnaeiiL'f Jnvn, :: iit: ..- iaeren. »crtsn ui2 ^ some parts of aes bilues, which in ·] :!« optical Fiöerstiv.n ^ e 37 or 38 g ^ l- ^ lenght. The left rectangle shows day BiIu in the left part of the aperture, because: j dig set by αen optical St Rank 37 arrives at αer light-responsive device 41. Dj ..-; right rectangle shows

9 0 98 k U / 0-8 9 3 ₀

the image in the right part of the diaphragm opening through the optical strand 38 to the light responsive device 42 arrives.

If the disc 11 rotates, reach different parts along the longitudinal direction is Eille 12 in the considered region of the diaphragm 35. Since the pitches of the Eille 12 deviate to the left and right of the center line 56, namely in accordance with the recorded by the sound waveform, These divisions become visible through the aperture on the light-responsive devices 41 and 42 and are recorded by them.

The optical system of the erf iiidun ^ sgemiUieii device is like this formed daij the image of the surface of the record on the diaphragm 35 (i.e. at the edges of the lens) v / ei ..; appears, while the Eille 12 appears black. The image of the groove 12 is to the right of center, as in aer Row A of pits I and II shown is on the right from the center more black / arzes. Therefore, more black fills

! into the field of view of light responsive device 42 and it receives correspondingly less light. This changes aich. the current flowing through device 42. In contrast to this end, the device 41 receives more light and the electrical current passing through it changes to opposite direction. '

BATH ORIGINAL 909844/0893

It should be emphasized once again that the groove constitute 12 of Fig. 5 rush groove or grooves of a moon speaking record and have therefore ■ uniform width. When the groove 12 deviates to the right, as described above, a small part of the image of the groove falls within the field of view of the light-responsive device 41. Since only a small amount of black falls into the field of view of the device 41, the latter receives a larger amount of light. The decrease in the amount of light received by device 41 is equal to the increase in the amount of light received by device 41. The strength de3 of the current flowing through the device 41 is just as much greater than an average reference current as the current flowing through the device 42 is less than this reference current.

At a later point in time, for example in row B of groups I. and Il is the picture of the R:. He 12 on the opening of the aperture 35 centered. The two devices 41 and 42 each have the same Parts of the image of the groove 12 in its field of view, and the electrical current resulting therefrom is in both devices same.

At an even later point in time, such as in the row ü of groups I and XI, the image of the groove 12 has become wavy to the left postponed. JYes then the largest part of the image of the groove 12 is in the left part of the diaphragm 35, em .. catches it Light responsive device 41 uses less light and reacts accordingly. The light responsive device 42, which is the minor Part of the groove 12 in its field of view receives more light and carries an electrical i-current flowing through it, its Strength so much greater than a mean reference current xsx, as the current flowing through the device 41 ages weaker

Reference atom 1st. _909844/0893

Ea is from the above description of the operation of the Device according to the invention in connection with Pig. 5 can be seen that ·; the output of the light responsive Devices 41 and 42 on the undulating displacements or deflections of the groove 12 in the record 11 responds. Thus, the two outputs of the devices 41 and 42 enter the one recorded on the record 11 Signal representing sound.

The operation of the optical-to-electrical transducer or transmission device according to the devices of the invention is best understood from Fig. 8, when the image of the groove 12 in the aperture 35 is centered, as in Appendix B in Pig. p, equal currents flow through the photo-responsive devices 41 and. In FIG. 8, the devices 41 and 42, respectively ^, are represented by the pnototranuiütoren 51 and: j2, if equal currents flow through both transistors 5 'and 52' , the outputs of the DC amplifiers 57 and 5t are also the same. Parts of the alternating current components in the outputs of the amplifiers 57 and 5i. Flowed through the capacitors 59 and 60 and the th α ±> sound signal e for controlling conventional sound reproduction; ^ ..; teme vsr -. 'ends. The outputs of the DC amplifier 57 tu * i 5S are also used beforehand to oriri.:3n the light bulbs o1 and 62 for lighting.

6AD ORiGiNAL 909844/0893

Since the outputs of the amplifiers 57 and 5C are equal to each other, the light intensity of the light bulbs 61 and 62 is also substantially the same. This same starkenLichtintensitüten v / ground of><, of photoresponsive devices S3 and added 64, including photocells, and it occurs because the devices 65, 64 appeal, no Gleichgewichtsveräiid 3runj of the Wheatstone bridge and on the connection .; 72 and 74 do not pick up a signal that would actuate the tone arm controller 75.

If aay picture -vir groove 1;.: The record 11 is more or ·. e: "-"'.; he Im E:> Idf aid le. · a transistor 51 or 52 lies _ than in the other transistor, such as in legs A and C i: i Fig. 5 thisirfc i - t, leads one of the transistors 55 and 52 more current than the other and one of the amplifiers 57 and pe has a correspondingly higher expansion than the other. As a result, one of the LiK ₁ , en 61 unJ 6έ ιί J t stronger Inteii .'-. Iti'.t al;.; the other and the reaction 1ü · photocells vj uiii 64 creates different jrce v'iiderstäriue in the Wheats'tonian Br.'Ci.a. D unit ferüt lie Wheats tones ehe; -rü-3r: 'j : i .: aeia j ..eic ^ 1. ichü una appears a / i. the connection: le..j; .iii l'-j at 74 eii, signal, aas from ..er Tonarmsteuervorrichtun; 7-j detects ir-i, ν ci'irch aer tonearm \ L in such a way occupied v / ird, lu ... aas image in groove 12 ″. Many centered v / ird.

9098ΛΛ / 0-8

The position of the uild.es d.;. R iiille 12 determines the relative size of the outputs of the translators 51 and 52 'that of the device 75 send a signal, which in turn controls the position of the tonearm 1 c3. This circuit is a bervo control system with closed (or feedback) circle, where the photo

51 and 52 egg el ·. : id. a Liniiuuu: ar. from the uC ^ Lillj. lc-tte transistors /! T transferring.r brightness to be set x search

12th
and thus the hat / the rotating record 11 follows.

The lightbulbs 61 and 62 have low magnetic reluctance to decrease in their intensity when glowing, and the controller 75 (which includes a motor, gear train, and tone arm) has inherent inertia which introduces time constants into the closed servo system. ΰϊβεε Zeitkon t ante η represent a limitation of the ability o.et bervosystems to bring the picture of the jiille 12 in a position in which it is exactly in line at all times. Section of the opening of the aperture 35 is located. The tonearm 1d, like the tonearm of a conventional turntable, therefore does not move forwards and backwards in accordance with the waveform recorded on the record. Rather, it follows the average position of the line 12 on the record 11, with the deviations from the average position of the waveform of the recorded. Τοηε represent.

6AD ORIGINAL SO 98 A W0893

From the above description of the mode of operation of the embodiment of FIG. 5 it can be seen that the direct current amplifiers and 5β serve both as a preamplifier for the sound and as a control amplifier for controlling the position of the tone arm 10. The amplifiers 57 and 58 remain isolated from each other. They therefore do not influence each other when stereo signals are processed. 6 shows the grooves of a stereophonic record; in contrast to the constant width of the grooves of a monophonic record according to FIG. 5, the width of the grooves of the record changes according to FIG different waveform than the opposite edge. Thus, mutually independent sound waveforms are recorded on the groove 12 of a stereophonic record. The ", / ellipses or waveforms at the edges of the groove 12 in FIG. 6 are exemplary for high-frequency stereo recordings and serve to explain the mode of operation of the device according to the invention.

As in Fig. 5, the divided rectangles represent the aperture at three different points in time over the grooves of the record 11. In Group III, enlargements of the grooves are at the same time points as in the same Row shown on the left, and the two rectangles in Group IV show the image of the groove 12 with its deflections from one Side to side in the opening of the aperture 35. Since the image of the groove 12 becomes wider or narrower when different If parts of the flille come into the image field, each of the light-responsive devices 41 ″ or 42 becomes a larger one

9Q98AA / 0893

or smaller blacks of the record groove. '. implemented and receives less bz »v. more light.

Each of the ranks of the row 12 represents a different waveform as the outer edge. The light range, which is one of the devices. 41 and 4 ^ in an instant .en ^ catches, int im \ · it borrowed, en from each of the other devices he read the amount of light escaped from devices independently. As a result, the actual strength of the current which is allowed to pass through one of the transistors ij1 or 5d does not need to be just as much greater than a weather reference value as the current strength which is passed through the other transistor is less than this Reference value is. In this way, separate channels of a stereophonic recording can be given separately.

Although the off rjuigjströme the Gleichstroinvcrst 'stronger 57 uni whether to-at stereoiiionen Sciiall _x ltitteii unabhilngi · from each other and take off their Grunduiveau DC remains in relation to aie, depending :: .. Str'Jier Vienn the BiIJ ier iesumten ftille 12 right or II !. ) -. z vvr. i? lies in the middle, as in I-.oihe L bzv ;. I "dei · Fig. 6; erel; t 1 t, are aie Ver.iti'rKer 57 and 56 from the. Gleich_ ; r. -".? Liz "brought, and .-. Ira of the control device 75 a Signuj .-! Bleak 13t, through which one tonearm £ 1 to the line of the Bills 1. " C3 .-. 3-; .iri. The eic “-ed-looi-Servca; ..; te;.: (with a closed loop) iiejar embodiment of the invention contains, as in the case of herk-l'nui.lioher i ^J littensi ieler and via ctjji. L 3written, a time constant that compares ae :: 3oliiieilereii fluctuations unemj. final I do, aie arise from 12I ₁ '-ο -lehneten hamlets ¹ orms =!:.

90984A / 0 893 _6aD OiuOiHAt

A number of grooves 12 are also shown in FIG. 7. A line 12a runs along the center of the grooves 12. This line is present when playing records with wider grooves and Tt revolutions per minute. Here, too, a number of diaphragms 47 are arranged over different parts of the groove 12 and the center line 12a. These diaphragms 47 üini the diaphragm described above. 35 similar, but additionally contain a further diaphragm opening adjacent to the opening present in the diaphragm 35. This additional diaphragm opening is followed by an optical fiber strand 39 which, in a focused manner, guides the image resulting from the diaphragm 47 to a further light-responsive device 45. The device can have an additional phototransistor with an associated on ; -n in the Tverjtürker , from whom the sound signals are fed to a common sound reproduction system.

Z.-i.joh iii 13Γ device \ ö and the optical fiber strand 39 i.it a light filter 44 with graded O | table density arranged. Incident light on the right side of the Fiitei goes without naming; .j. The nitriding is carried out through the filter. On a liiiiien part ue .; FiIt er j eiiif ■. !! ■ ahdes light v / iru from ieiu filter u.-'..'_,;: iilten uu-i, w enu: o-irri- ¹ . ¹ ^ t, penetrates only '.venig Lioht durcl'i uiej ί :. Toil ies Filters. Duron -ien middle part dea Filiers 44 j-rin ^ t a r.:ittiere Lionteenge through. In (JrUL _1. E V, Row X, Y ur.a Z of Fi :. 7 it shown, v / ie the Dili α er I .-; i tt ex line 1: a in the additional opening of the diaphragm 47 ve r. -V: Cu ::, to 'litte and' veiter to left rüci't. V. ei.ii ia'j BiIi i-jr line 12a ^ i -vie in row X in the Gfrup ^ o V te ve ·.: J- ¹ .:.;. '; ..- dJi.i'et,: -: A · ..,' . T un ^ eliinaei't

9098AA / 0893 o ^

• - 29 -

the right part of the filter 44. The one reaching the device 45 Light is therefore of the greatest intensity, as can be seen in Group VI, Row X. The image is located in the Center line 12a * in the middle, v / ie in group V, row Y, goes it passes through the middle part of the filter 44 and is partially filtered away. That device 45 is reaching light then of medium intensity, like from group VI, row Y, emerges. When the centerline 12a image is to the left of center, as shown in Group V, Row Z, it is almost completely filtered off by the '44 filter. The light then reaches device 45 with very low intensity, as can be seen from group VI, row Z. Thus determines the relative position of the center line 12a is the intensity of the light which the light-responsive device 45 receives. This eases the output or Output ice exercise of the device 45 and generates an electric wave, which is recorded on the Bou3n .der groove 12 of a record with 78 revolutions Corresponds to capstan. In Sehall plates with 78 Umui-ehungen per minute, the openings of the diaphragm 47, the aeii3xi u3r aperture 35 are similar, i.e. the divided rectangle, again uen optical fiber strands 37 and 38 and the devices 41 and 42 assigned. In this case it will Signal from devices 4I and 42 only used to generate the Stable the Τοη * -α * ηΐΒ 1b in the manner as above in the description of Fig. 5 was carried out while the sound reproduction from the electrical signal on the device 4 "3 goes out.

BATH ORIGINAL 909 844/0893

Older or very old records with 78 revolutions per Minute played on an ordinary needle turntable were deformed and scratched, creating a making it difficult to play again clearly with a needle. However, the center of the grooves is made according to the invention protected by their side flanks. In this central part, therefore, the same scratches and generally do not occur Signs of wear and tear as seen on the groove near the Enter record surface. Through the optical playback Such records will not wear out any further and their quality will be retained. Also know old and worn records can be played with greater clarity as only the center of the grooves is used.

Bs is evident as ^ the general, in the above Description of the embodiments disclosed basic ideas The invention can be applied to many modifications and other embodiments are possible. It is particular determine that the number and arrangement of the prisms in the optical system depending on the particular shape the desired support frame can be varied.

The optical sydtam can be achromatic for better imaging Own lenses and be completely color corrected, or It can in most cases if you have a filter to filter out all light except light of one wavelength built in, to which the phototransistors are most sensitive are cheap, non-achromatic plastic lenses used will.

909844/0 893 6ADORlGiNAL

In many cases, the size of the optical system can be reduced, if desired, by reducing the size of the optical fiber strands at the ends adjacent the bezel. Then the image produced on oils does not need to be so large. to be and the necessary enlargement can be smaller. A larger number of different mechanical devices could be used to control the position of the tonearm and to rotate the turntable. Furthermore, a suitable itiechanisLJUs aur vertu », ilen adjustment of the tonariua for the correct foj.uijsierurj the Strihlenbunjelo on the groove of the record can be provided.

The described preferred and useful way of carrying out the invention relates to Gib-eii i ^J li ttenc.ieler with a rotatable plate. Di ^ optical and>. t.le ^ rrische inventive Tonwiodcrgabeeinrü chtunj l?:.; t irich erficht-Iich but also entr _x i-.iCnend £ iiv.'ci.den, if the: .. ecii ".r, ir ehe

Inverter ionaui'rri. iciiriu.r in a groove another.n.- ^r _'or.tr ^: .ig ^ re,

z. B. der c-beri ^1!; before f = inec Ii uf grooved l'onbr παΐ-ε · or ^ relieves is appropriate; the expressions "..lr.ttenr.yi .ler", "Schallplitte" and "-tlatxenteller" stand ciani: for c ie correspondingei.aon leL-i the '»/ iedergübeeinriclitLing of such a.-fii · ;? : r.it. "onrille.

909844/0893 6AD ORiQiNAL

Claims (5)

PhilliTj iruce Dahlen December 5th, 1966 Pat e η t a η s ρ r ü c h e . Device for sound reproduction on a phonograph record player with a turntable and a drive device for the rotary drive of a record provided with a sound groove, a movable tonearm and a device for moving the tonearm and with a bucket converter for converting light signals, characterized in that there is a light source ( 13)> an Ibjehtiv (17) and a swi -. ^ Chen light source and objectively an- ^ ecranete ei-ε-ΐβ ο tiyclie device (optirche trans .: fertilizers 14, 15, 16) a bundle of rays about right through the lens on one on ο em xl ;. vcenteller lying "iichallplatte (11) ger λ eiltet and Fn the f.-it is brought zvr reflection, dai ^ a tin ο: ■:;!. · cues di ^ rial as tor-re ^ cbenv.e Tonviedergabevorrichtui-t; Oi? 1, ^ - , b'l, b · - etc., i'i ^ :. o) in front of ^ erehen and üv; if-; chen the lens \ χτΛ the ion ^ / iede-rgacevorrichtun ^ a z -.- eite optirche VorriCiItIVn ₀ - (19 or 21, 22; 27, 35, 57, 3B) is arranged, the air Lc :. väeaorzu ^ ebende O ₁ -ϋ is before signal to the ^r -onv: i ':: corr- ^: -PVcrrici-tunr supplies, and daii aie second optical /orrichtu:-./ r: ii.d. :: part. ^. a? /. v -.; - .. chen the first optical Device ui.α dar vc ^ t .-: tiv engaging o. * ::. Ches limb (19 in i'ig. 3 bz '. ". 21 in _ :: -; -. ..) auiv.oist, represent: a, predetermined part of the-; Obje-.tivr: from left :. jj :: OcieuciLtenaen Ltrt./.leribünael e.brcnirmt and according to rej.n: .r A: crdnung in the ^ .vrtlX'iri & pxit rather: device 9098AA / 0893 also receives light reflected from the record and passed through the shielded part of the lens and directed at the part of the second optical device which transmits this light. 2. Device according to Claim 1, characterized in that there / a in the second optical device (19 or 21; 22; 27, 35, 37, 38) from the record (11) reflected, polarized Light from the sound reproduction device (51, 52, 57, 58 etc.) polarizing filter (23) keeping away is arranged. 3. Device according to claim 1 or 2, characterized gekennaeichriet that the second optical device (19 or 21, 22; 27, 35, 37, 30.) a diaphragm opening ₍ delimiting diaphragm (35) and sv. ^R egg optical fiber strands (37, 30), one end of which is arranged in the opening of the diaphragm, these ends forming a microfine connection point (36) which divides the opening essentially into two areas, and furthermore the second optical device counteracts the reflected light diece ends of the router strands directing optical means (27, 29), and in that each one of the other ends of the optical i ^l ös he strands through each one of two transmission device s (41, 42) to the sound reproducing device (51, 52, 57, 5es etc.) is connected in such a way that the reflected light is transmitted to it. 909844/0893 4. Device according to claim 3, - characterized in that the Tonwiederga.beeinrichtung (51, 52, 57, 58 etc.) a first and a second light-responsive, current-conducting device (51 or £ 5) contains, each in one electrical unit rather than the price of electricity lie and then to one of the ends (at 41, 42) of the optical fiber strands (37, 3b) arranged so that the strength of the currents conducted by the light-responsive devices in each case proportional to or after the output which ran through one and the other optical fiber The light sources guided are changed, and that the starting point is lemrne each of the light responsive devices with the sound reproduction device (59, 60, 57 and 58) is connected. 5. Device according to one of claims 1 to 4, characterized _t '; e. Ennzeichnet that of controlling the position' Xonarms (18) is provided (via control means 75) a errte and a second "signal generating means (61 and 62) are, of which one is connected to the output terminal of the first and the other to the output terminal of the second light-responsive, Strom.leitenden device (51 or v /. 52), the current passage of which is determined by the associated generating device (61 or . 62) controls that an electrical bridge designed for balance with four branches (63-65) is also provided to control the position of the tonearm (63 or 64) the- OAD ORIGINAL 909844/0893 or art is arranged that it responds to a signal of the one (61) or the other (62) signal generating device with a responds to the corresponding change in the Sxrom flowing through it, and that output terminals (73 »74) of the bridge are connected to the control means (75) for moving the tone arm, and to this a control signal causing a tone arm movement transmitted if and as long as the bridge is electrically unbalanced. 6. Execution according to claim 5, characterized in that the dali Big mileage generating devices, light bulbs (υ1, 61) and signal receivers Photo cells (65, 64) are or contain. 7. Device according to claim 4, 5 or 6, characterized in that the light-responsive current lej.tiiri-iei: devices xhototr- nsistors (* 1, b · ') contain cattle. d. Device according to an oer Ar. no (i ^v j) with fei: .er ,, one end insideLn ^ b of a second aperture of the aperture (J> b) ? nge'cracht is and d?: - cv.i. to this third. o _: ■ t.ie.chc-i. ^ users ':; ■ ig and a v ^p itc-rfi ·, on light to the researching device (4i ^.; ' in optically ·: -s. i'iiter (44) arranged .'..- ot, lc- csen opt see density or lightness is so graded that .. 9098U / 0893 ^ d original - ^ - serstrangs of the position of the beam on the optical PiIter or depends on the area of the optical filter, in which or in which these are acted upon by the reflected light will. 9. Device according to one of claims 1 to 8, characterized in that that the err-th optical device includes an optical prism device (15) and a telescope (H) which between the light source (13) and the optical prism device (1b) is attached in such a way that it would be a good idea to A bundle of rays consisting essentially of parallel rays on the prism device, and dt.Jj the prxsmen device : · Ο is set, dais κ ie the bundle of rays through the lens (17) essentially perpendicular to the bell plate (11) lying on the turntable (10) Direction learns. 10. Establishment: j ch eir.em der Ans; .. rl ehe-1 oir. 9, characterized in that de dt-a in the first optical device (H, 15, 1b): i -.;: Iae or, ". Isciie.'j-lied of:; /:, iten optical device (19, -V, OZt 37, 3ö) is a rhombic-cr.es prisma (19), and there: 2 die: v.veite 0 tircho /crrichxuj.- _: eir. Ly :: tem aur several optic-. en rr:.:, (· ■: ( cL - 2C) and V ^ rrr ^ iieruixgrjline en (27) contains, by c.ie dar rf-fl ¹ Ittierte ij. '. cLtr-xrt.hTenbündel enlarged and on aie 'Jonv / iedergrbevorrichtung (l'<, 52, 57, 50 etc.) is judged, ui: d da-: aar irclt.r: '.'- ■ ti.or.r filter (23) z- ± ^r ci .eri 6AD ORiGiNAL 9098AA / 08 93 - χ- 3? Diecem rhombiechen rrisma (19) and this lectern of optical ± Ti: -raen (24, 25, 26) and enlargement rrisma: en (27) the one
art is arranged, dai-i the / reflected light that polarizes is filtered out. Of the k.-7i BAD ORIGINAL 9098AA / 0893